I have Lenovo H530 Desktop which comes with Windows 8. I tried to install Ubuntu on the system and ended up messing something on my way. Current status is my system won't boot into either one of them and will just fall into GRUB shell on startup. I have a 64-bit system with EFI.
I followed the instructions here as follows.
DISKPART select disk 0 select vol 2 --> EFI assign --> resulted in F: drive select vol 3 --> Windows8_OS drive (471 GB) assign --> resulted in G: drive exit cd /d F:\EFI\Microsoft\Boot\ bootrec /fixboot ren BCD BCD.bak bcdboot G:\Windows /l en-us /s f: /f ALL
Everything was success till here. But reboot still results in GRUB shell.
I have also tried following links
but not much success. Any help to solve this would be really appreciated.
EDIT 1: bcdedit results in error The boot configuration data store could not be opened. The requested system device cannot be found